1. Use a larger gate area WL, which has less flicker noise. Since often the op-amp input devices dominate the noise, these should have large gate areas.
2. PMOS devices have considerably smaller values for the constant K than the NMOS ones. So PMOS transistors are preferred in the design.
3. Correlated double sampling at the opamp input may store some noise and then subtracted from the signal. This introduces a highpass filtering of the noise and suppresses it effectively at frequencies which are much lower than the sampling frequency.
4. Chopper stabilization can be used to modulate the 1/f noise out of the signal band.
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